High Quality Content by WIKIPEDIA articles! Sodium trimetaphosphate, with formula Na3P3O9, is a metaphosphate of sodium. It has the empirical formula NaPO3. It is the sodium salt of trimetaphosphoric acid. A metaphosphate ion is an oxyanion that has the empirical formula PO3?. The structure of a metaphosphate ion can be described as being made up of PO4 structural units in which each unit shares two corners with another unit. This can come about in two ways. An oxyanion or oxoanion is a chemical compound with the generic formula AxOyz?. Oxyanions are formed by a large majority of the chemical elements. The formulae of simple oxyanions are determined by the octet rule.

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